Electrical measuring instrument.



G. M. GR OOK. ELECTRICAL MEASURING INSTRUMENT.

APPLICATION FILED NOV. 27, 1908.

1,073,098; Patented Sept. 16,1913.

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' E Man/m0 i v ATIWQS G. M. GROOK. ELECTRICAL mmsuame INSTRUMENT.

APPLICATION FILED NOV. 27, 1908.

Patented Sept. 16,1913.

4 SHEETS-SHEET 2.

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APPLICATION FILED NOV. 27, 1908.

1,073,098. Patented Sept. 16, 1913.

4 SHEETS-SHEET 3.

Invenlur Charles M. Eruuii AIImrneHs O. M. OROOK.

ELECTRICAL MEASURING INSTRUMENT.

APPLICATION IILED NOV. 27, 1908;

1,073,098, Paten ted Sept. 16,1913.

4 SHEETS-SHEET 4.

. llmmlm l llllll WIIILE 5 5 ES Invfilfir g, EharlBsM.FIrc1ui Am a STATES PATENT OFFICE.

CHARLES 11.61003, or CHICAGTLLINOIS, AssIeNon TO THE wILLIs ELECTRIC marl-In. (20., or cnrcaeo, ILLINOIS, A donrona'rron or ILLINoIs.

nLno'rnIeAL MEASURING INSTRUMENT.

Specification of Letters Patent.

Patented Sept.16,1913.

Application flled liovember 27, 1908. Serial No.464,545.

' To all whom it may concern.

Be it known that I, (JHAnnesM. Onoon, a citizen of the United States, reslding at Chlrago, in the county of Cook and State of Illinois, have invented a certain new and drawings, forming a part of this specifica tion.

My invention relates to electrical measuring instruments, particularly to wattmeters, and contemplates more mechanical and economical construction and arrangement of the various parts.

In meters of the prior art the mechanical construction and arrangement is faulty; More or less complicated and unnecessary mechanism is used for supporting the meter parts, the result being a large and bulky meter. The various parts in these prior instruments are supported and connected together usually by threaded members which very readily jar loose, thus disturbing the assembly and adjustment. Separate pivot members are usually provided for the armature and for the integrating mechanism driven by the armature, whlch members readily lose their relative adjustment. In

general, the construction and arrangement of meters of the prior art are such that the supporting parts must be very heavy and complicated in order that the meter operative parts will maintain their adjustment,

and in order that the meter can be shipped without resulting in loosening and derangement of the parts.

The construction and arrangement of my invention are such that a minimum number of parts areso constructed and applied that meter adjustments will remain constant, and such that the meter can be readily shipped without danger of the parts becoming loosened and deranged.

Other features of my invention cover simplified adjusting means for the controlling parts, particularly the adjusting means for the brush mechanism.

A meter which embodies the features of my invention is shown in the accompanying drawings, in which Figure 1 is a front view of the meter, the cover arts being removed and the integrating mechanism being cut away, Fig. 2 is a sectional view taken on plane 2-2 of Fig. 1, Fig. 3 is a top view of the meter with the cover removed, Fig. 4 is a front view of the integrating'mechanism, Fig. 5 isa sectional view taken on plane 55 of Fig. 2, Fig. 6 is a sectional view of the common supporting member for the lower armature bearing and for the damping magnet adjusting member, Fig. 7 is a view from the left of Fig. 2 showlng the arrangement and design of the adjusting coil and the resistance coil,

the field coil being shown in section, Fig. 8 is a sectional view taken on plane 8-8 of Fig. 1, showing the method of supporting and insulating the brush adjustment frames, and Fig. 9 is a top view taken on plane 99 of Fig. 8.

The meter supporting frame F has the rectangular base 1, from which extend the walls 2, 3, 4 and 5, which inclose the main parts of the meter, and from the lower end of which also extend the walls 6, 7 and 8, which with the wall 5, form the terminal compartment 9. The walls 2, 3, l and 5 are engaged by the cover 10, preferably of glass, while the compartment 9 is closed by a lid or cover 11, which lid is riveted at one corner 12, so that it may be swung open and shut, and which at its opposite corner is adapted to be locked in the closed position by screw 13 passing through the lid'into engagement with the lug 14. On the lid is a lug 15 surrounding the screw 13 and having a pocket 16 for receiving the screw head, there being a hole 17 through the upper part of the lug 15 through which a sealing wire or pin can be passed to engage over thehead of the locking screw, and thus seal said screw in its locked position. Extendin from the top of this base 1 is a supporting lug 18 having the opening 19 and the slot 20 leading therefrom. When the meter is to be supported in place the head of the support-ing screw passes through the opening 19 and upon lowering of the meter then engages in the slot 20f Through the lower part of the base within the compartment 9 are two or more screw holes 21 through which screws may be applied after the slot 20 engages under the head of the top supporting screw, and the meter will then be securely held to its support. After the lid 11 is applied and sealed the meter cannot be removed from its support without disturbing the seal. This has a tendency to prevent unscrewing of the the base 1.

meter fromits support and tampering with the parts thereof.

Extending from. the base, near the top thereof, are a plurality of supporting bosses 22, four of these being shown. These lugs are elongated and extend toward each other and at their innerends form seats for the field coil 23, which is arranged arallel to The field coil is he (1 against vertical displacement by pins or posts 24, extending from the upper and lower seat lugs 22, and the coil is held against lateral displacement by posts extending from the side seat lugs. The coil is held against the seat lugs by the annular plate 26, of nonmagnetic material, and having the slot 26 for breaking up eddy or other disturbing currents this plate having cars 27 engaging the threaded extensions 28 from the ends of the side posts 25, washers 29 and thumb nuts 30 engaging the threaded ends, whereby the plate can be securely locked to the ends of the side posts and against the coil to lock the coil to the seats, lateral movement of the coil being prevented by the posts 24 and 25. The seat lugs are cast integral with the base and the posts are driven into openings which extend through the lugs and may be riveted at the other side of the base, the end ofthe posts which is driven into the lugs being of slightly reduced diameter. This driving fit of the posts insures their permanent position and consequently the field coil will always assume the same position with reference to the other meter parts. If the posts were threaded into the lugs, they would be apt to become loosened by the jarring of the meter, particularly during shipment, and the field coil would become displaced. To remove the field coil it is only necessary to undo the thumb nuts 30, whereupon the plate 26 can be removedand the field coil slid from the lug seats and from the retaining posts; and when the coil is again applied, it will assume its former position without readjustment of any kind.

At the top of the frame end extending from the base are two lugs 31, 32, supporting the arms 33 and 34 respectively. These arms have reduced ends which are driven through openings in the lug and which may be riveted at their ends at the back of the base. Clamped tothe lugs 31 and 32 by the shoulders 35 of the arms isthe brush mechanism supporting frame 36, which will be described more in detail later. The arms 33, 34 are conveniently rectangular, their front ends bein cut down to leave shoul ders 37 and shelf parts 38 Supported from the ends of the arms and secured to the shelf parts 38, is the supporting and pivot plate 39, whose shape is best shown in the top view shown in Fig. 3. This plate has slots 40, 41, extending forwardly from the rear. edge thereof, these slots being adapted to engage :under the heads of screws 42 which thread into theshelf parts 38 of the arms 33 and 34. Between theends of the arms and the screws 42, pins 43 are driven tightly into openings in said arms, these pins being received by the openings 44 cut in the plate 39 in front of the slots 40 and 41. The rear end of the plate 39 at its.

with the base, the arms 37 being driven and rivet-ed in said lugs, and the plate 39 being held so securely-to said arms, said plate is absolutely rigid and will maintain this rigidity without danger of becoming loosened during shipment. The plate, how= ever, can readily be removed for inspection or repair by merely withdrawing the screws 42, but said plate will assume its true position when again applied. This plate also supports or forms a bearing for an armature spindle 46, this spindle being vertical and supporting a spherical armature structure 47. The spindle passes diametrically across the field coil and directly in front ofthe plate 26, the armature extending through the plate into the field coil.

At the lower part of the frame is the lug 48, also cast integral with the base plate, this lug supporting the post 49, best shown in Figs.- 2 and 6. The reduced end 50 of this post is driven snugly into the lug 48, the post thus beingrigid. Extending upwardly into the end of said post 49 is a threaded pocket 51 for receiving the screw 52 which supports the lower bearing 53. This bearing 53 is concave and secured in place by its leg or extension 54 which engages in the end of the screw 52. In thepockets is such that the ball is confined to the concave bearings and therefore no matter how the meter is jarred or jolted, the ball will always roll to its proper pivot position when themeter is secured to itssupport. By means of the knurled head 59. the screw 52 may be adjusted in the threaded pocket to adjust the ball bearings. A jam nut 60 serves to lock the screw 52 in any adjusted position. The ball bearing supports the entire weight of the spindle and parts mounted thereon, the upper part of the spindle having the bearing pin 61 extendingthrough the pivot opening 62 in the plate 39.

. anaemia At the upper end/of the armature spindle is carried the commutator 263, whose segments are connected :with :the armature. This .commutator is engaged by brush terminals 64 and-65 whose supporting mechanism will now be described.

The ends 66 of thebrush mechanism supporting frame 86 extend downwardly, as shown-in Fig. 1, each end supportingabrus'h regulator frame 67. The base or foot-68 of each frame 67 is secured to the-corresponding end 66 of the frame 36 by means of a pin or rivet- 69. The frames 67 should be insulated from each other, and therefore from the frame 36. A bushing 70 of insulating material therefore'lines the elongated opening 71 through each end 66 and insulating washers 72 and 73 are applied at opposite sides of the end 66, a metallic rivet washer 74 being at the outside of the insulating washer '73. "The flat rivet pin 69 extends through corresponding openings in the foot 68, insulating Washer 72, '73, and the rivet washer -74, and also through the insulating bushing 70, the shoulder 75 on the pin engaging against the foot 68 of the brush frame 67. The end of the pin is then riveted over against the rivet washer 74, and the various members are securely and rigidly held together by this rivet pin, the insulating bushing and washers serving to insulate the brush frames upon the main frame 36. A threaded extension 76 from the between which nut and the body of the rivet PlH,'t6]3lTllI1[l wires may be clamped for connecting the brush frames-67 in circuit. EX- tendingdownwardly from'the front end of the horizontal part ofeach brush frame 67 is a pivot pin 78 .which'may be riveted securely ito=the brush frame. On each pin is pivoted a hub or collar 79 having a slot 80 in which is wedged theend of .a flat spring 81 which carries at its ends one of brush contacts 64, 65. Each hub is held to its pivot in some suitable manner, as'by wire washer 82 bent about the pin end. As a means for holdingthe brush contacts against the commutator spiral springs 83 connect between thebrush springs and slide plates 84. Each plate is parallel to the upturned end 85 of the brush tframe 67 and has hooked ends 86 :for engaging about the edges of the brush frame. Each slide plate carries a threaded log 87 which receives the threaded end of the micrometer adjusting screw 88. The reducecl end 89 of this screw passes through the upturned part-85 and=has secured thereto the knurled head '90. "Turning of this: 'knurled head causes rotation of 'the screw? and sliding of the .plate 84 longitudinally? along the horizontal part of the brush frame;

do put more or less tension on .the corre-i sponding brush adjusting sprlng 83. Eachi ehooked end of {the-slide plate :has a hole 91.

.on each 'side of :the pivot 'hub. The spring :83 for each brush may therefore be con- ;nected with the brush spring at the inside .or the outside of the (pivot hub, depending upon-which side of-the commutator is to be ,engaged by-thehrush contact. llhe arrangementof these 'holes also makes the slide ,plates and the ibrush springs all alike so that only one ifoinn need be manufactured which can b (used on either side ofrthe commutator. The arrangement of the brushes and brush adjusting mechanism is, perhaps, best shown in ,Fig. ,5. -Referring to said figure, the left hand brush engages the rear of the commutator and therefore the corresponding brush spring connects between the'inner holes of the slide plate and brush spring. The right hand .brush engages against the front side of the commutator andit-he commutator spring is'at the outside of the brush springpivot and connecting between the .outer holes of the brush spring and slide plate. Each spring and its adjusting micrometer screw are parallel, and therefore temperature effects are counteracted and the proper adjustment of :the brushes maintained. For example, suppose that the springs are heated and owing to their temperature coefiicient become longer. This means that the tension on the brushes is lessened, which might disturb the adjustment. The micrometer screws, however, being parallel with the springs also stretch due to thechange in temperature, which results in further distention of the springs to offset the increase in length of the springs due .tothe change intemperature and therefore-the brush contact engagement with the communtator is maintained constant. As will appear in the copending application of Georg M. W'illis already referred to, the engagement of the brush contacts with the commutator serves'as a means for adjusting for accuracy of the meter under different loads. The construction which I have just described which maintains constant contactconclitionsbetween brushes and commutator therefore forms a very important feature of my invention. The micrometer adjusting arrangement will always maintain its adjustment independently of jars or other disturbances and the brushes, when once adjusted, will-maintain such adjustment. The top plate 39 has tw'o sight openings 93 through which the brushes can be readlly inspected.

The plate 39 at its front end forms the top wall for the integrating mechanism housing, the lower wall 94 of which is suspended from'the plate39 by posts 95. The various transmission shafts for transmitting movement from the armature spindle tothe order wheels are all vertical and pivot -in the=top:plate 39 and 'lowergplate 94. As

has been before shown, the upper end of the armature spindle also pivots in the plate 39. The armature spindle and the various integrating mechanism shafts all pivoting in .vide a pinion 96 which meshes with the gear 97 mounted on one of the vertical shafts of the integrating mechanism. Rotation of this car is transmitted through a number of ot er gears and shafts to an elongated pinion 98 which meshes with a gearwheel 99, secured to the shaft 100 which is vertically reciprocable and which carries a worm 1.01.

Formed integral with the worm 101 is a cylindrical cam 102 which cooperates with the cam roller 103 to cause the vertical reciprocation of a shaft 100 upon rotation of said shaft. The worm meshes with the pinion 104 secured to the units member of the order wheels 105. The pitches of the worm cams are such that the pinion will not be rotated during the combined rotation of the worm and forward movement of the shaft. However, whenthe cam offset is reached and the shaft released fro-m the cam roller, the shaft drops without rotating and therefore the worm during this downward movement of the shaft causes rotation of the pinion and movement through one division of the units wheel. To insure the return of shaft 100 upon release of the cam 102 from the roller 103, I provide atop cam roller 106 which cooperates with a cylindrical cam 107 formed integral with the worm 101 at the upper end thereof. The shaft 100 duriug operation of the meter continuously rotales and if for any reason this shaft should not fall immediately after the lower cam offset reaches the lower cam roller, the upper cam will be engaged by the upper cam roller and the shaft given a downward impulse, whereupon it quickly drops to its lowermost position, the worm wheel during descent of the shaft causing rotation of the units order wheel.

In my construction'the integrating memhers with their driving pinion and carryover-mechanism can be bodily removed very "readily from the driving mechanism and when thus removed can be readily and quickly restored to any desired indication. p

The units member carrying the pinion 104 and the other order members are mounted on the shaft 108 which is pivoted in the side walls 109, 110. These side walls are secured to depend from a' top plate .111. The top late 39 has the opening 112 out out of its rontedge, throu h which opening the side walls pass when t e integratin *mechanism is to be applied, the ends of t e top plate 111 engagingon'the to plate 39 adjacent the opening 112, as best s own in Fig. 3. In

109, 110 and at the top thereof the countershaft 115 is pivoted which supports the carry-over members.1l6., a slot 117 being cut in the front edge of the top plate 111 for receiving these carry over members. When the plate 111 is removed. the integrating members and their carry-over members are bodily removable from the driving mecha-. nism and resetting of them'embers can be quickly and easily accomplished. This re moval of the integrating members in no way disturbs the driving mechanism.

At the lower end of the armature spindle is mounted the retarding disk 118 which disk is spanned by a retarding magnet 119. Cast integral with the base 1 is 2. lug 120 from which two posts 121 and 122 extend outward, the posts being driven into said lug and thus being very rigid and permanent. At the upper end these posts are joined by a clamping plate 123 which is secured to the post ends. Slidably engaging the posts below the fixed top clamping plate is the clamping plate 124. Between these clamping plates is the horizontal base 127 of the damping magnet the plates being held in clamping engage ment with the magnet by means of the .end plate and threading in the sliding plate. The magnet is locked against lateral displacement by the flanges 125, 126, or the plates 123 and 124 respectively, and by the posts 121, 122, against which the magnet engages. The magnet is clamped between the plates so that its pole ends span the retarding disk andby loosening the clamping screw the magnet can be slid tangentlally with respect to the retarding disk to thereby adjust the retarding effect. The magnet can also be very readily removed entirely and when applied between the clamping plates will always assume its correct position with reference to the disk. As a further means for adjusting the damping effect of the magnet there is ashunting. member or'wing 129 arranged to-be adjusted toshuntmore or less ofthe magnetism around the magnet poles: The arrangement of this adjust-ingwing is best shown in Fig. 6. A threaded 133 extending. from the locking, nut 134.

'1o-adjust,.the nut 134 is loosened andsleeve 131- can then be'rotated t'o bri1ig. the adjusting; wing intoposition to cover more orless of the pole ends and to-adjust the distance bet-ween the adjusting wing and the pole ends. \Vhen the desired adjustment is reached, the nut 134: is tightened and the ends ofthe split sleeve clamped to the extension 130:. The retarding adjustment for.

controlling the speed of the meter can -therefore bemade very quickly and easily and with great accuracy.- To prevent disturb-'- ance of theniagnetismof the retarding magnet by the field of the field coil, a magnetic shield' 135 is interposed between the field coiland retarding magnet This magnetic shield is in the form of an ironplatearrangedhorizontally and having the vertical footl'36-which engages-the-lug120' and whicli has openings through which the posts-12 1, 122, pass, the foot being. securely clamped to the lug by shoulders-on these posts. The shield also has the slot 137- extending rearwardly from its endfor" receiving the armature spindle.

In'Fig. 2,-and particularly; Fig. 7- is-sh'own the'manner in which an auxiliary coil and a resistance coil are supported; A- double spool 138" has .anextension 139' which is driven into the lug 140, forming: part of the meter base plate'and this spool at its-front part supports the auxiliary co'il- 14-1- and at its-rear part the resistance coil-1 12; The auxiliary coil extends into'thecore of the field' coil and adjacent the armature so' that current flow through said auxiliary coilwillgenera'te an=auxiliary field for the armature. In practice, the auxiliary coihth-resistance winding, commutator brush and .segments; and the-armature winding. are included serially ina circuit conneoted=in bridge of the main circuit to be measured.

In- Figs. 1 and 2 are' shown: the terminal connecting sleeves which are four innumberand which extend through openings in the walls 8' and 5 of the meter frame andthrough the'compartment 9. Each sleeveis formed as shown best in Fig. 1, the bore 143- receiving: an external wire which is clamped in said bore by clamping. screws-- 144; theinnerbore145 of 't'he sleeve receiving: a wire from the meter circuit which is clamped ill-Said hereby a: screw 1A6. Aiterthe m'eterhas been properly installed, the lid 11- is closed and-the' locking screw 13 applied and' the sealing. wire or pin inserted through the sealing. openings. In order to tamper wit-lithe meter connections it therefore becomes necessary to-break the seal. The sealing; lid also incloses the screws which pass through openings 21,. and it is therefore impossible for the customer or other parties to changethe position of the meter on-the wall which' might result in its being" thrown into a position in which it would not operate properly.

Theglass cover 10' for closing the main part of the frame engages the edge of the frame, suitable sealing material 1&7 being inserted between the cover and the frame, thecover being held in place by thumb nuts 148- engaging the ends of posts 149 which are driven and riveted inlugs 150, and which extendforwardly through the openings 1 51 in-the glass cover,-rubber or leather washers -152- intervening between the nuts and thecoven- With the construction and arrangement as described the active parts are opentoin-- speotion andcan very readily and quickly be removed for closer inspection orfor re pairs. By removing. the top screwsA2,-the plate- 39-withthe integratingmechanism can: be-removed,-thus-releasingfthe upper end of the armature spindle. The retarding. mag: net being. slid away from the retarding disk, the armature spindle can be lifted from the lower bearing and removed from the meter,

the spindle passing through the sl'ot' 137 in the magnetic'shield. By then withdrawing the thumb-nuts'30,'-the plate 26 can be'withdrawn from the'field coil-to allow the field coil to-be removed.- The brush spring with the brush contacts can readily be removedby withdrawing the wire washers 82 from the pivot-pins 78. When the parts are again to-be assembled, theywill'assume their correct positions owing to the various means employed for centering and for guiding theparts into'such-proper position. By virtue of these guiding. and centering means only very simple means are necessary for holding the parts in: place. For-example,- only two screws 42- are necessary for holding the main plate 39 in-its proper position, and only two thumb nuts-29 are necessary to lock the field coilin place. The driving engagement of the-varlous-supporting posts and members with the lugscast integral with the baseplate of the meter causes solidity rigidity and strength, which is not found in other meters-and as a'consequence a meter involving my improvedfeatures ofconstructionand arrangement can be shipped fromthe factory after being set up andadjusted with assurance that' it will reachits destination w-ith alhthe parts in-perfect order,-alinement and adjustment. The partsjare very few in Patent:

.ing posts adjacent number and of the simplest construction and I arrangement. There are no delicate parts, the mere touch of whichmight result in unbalancing the meter and throwing it out of ad ustment. As a means for protecting the brush contacts 64, 65 which are dehcate .stri s of-preferably platinum, the ends 153 of t e brush springs 91 are bent about the ends of the contacts as shown.

Having thus described my invention, I desire to secure the following claims by Letters 1. In an electricity meter the combination of an armature, torque produclng means for said armature, a retarding disk adapted torotate upon rotation of the armature, a retarding magnet spanning said dlsk, supportthe disk and parallel thereto, a stationary clamping member on said posts, a movable clamping member on said posts, and a clamping screw engag ng said clamping members, said magnet belng secured between said clamping members.

2. In an electricity meter, the combination of an armature, torque producing means for 3. In an electrlcity meter, the combination of a supporting frame, an armature pivoted.

on said frame, torque producing means for the armature, a speed regulating disk for the armature, a damping ma st for said disk, posts extending from said frame and rigidly secured thereto by being driven into A openings in said frame, a stationary clamping member on said posts, a slidable clamping member on said posts, and means for causing said clamping members to clamp the damping magnet to hold it in rigid position with reference to the disk.

4. In an electricity meter, the combination of a supporting frame, an armature pivoted on said frame, torque producing means for said armature, a speed regulating disk for the armature, a damping magnet having a part parallel with said disk, supporting posts extending from said frame, a olampin member secured to said posts, a secon clamping member slidable on said posts, and means for drawin said members together to clamp the paral el part of said damping magnet, sliding of said damping magnet between the clamping members upon loosening of said members causing adjustment of said magnet with respect to the disk. I

5. In an electricity meter, the combination of a supporting frame, an armature pivoted on said frame, a field coil for the armature,

a speed regulating disk for the armature, a retarding magnet for said disk, supportin posts for said magnet extendin from sai frame, and a magnetic shield %etween the magnet and said field coil, said shield being secured to the frame by the engagement of the posts with said frame.

6. In an electricity meter, the combination of a supporting frame, an armature pivoted on said frame, field producing means for said armature, a speed regulating disk for said armature, a retarding magnet associated with said disk, posts for supporting said magnet, said frame having openings and said posts having reduced ends for engaging wlth driving fit in said openings, and amagnetic shield interposed between the field producing means and said magnet, said shield being secured to the frame by being clamped between said frame and the shoulders of said posts.

7. In an electricity meter, the combination of a supporting frame, an armature pivoted on said frame, field producing means for the armature, a speed regulating member for the armature, a retarding magnet associated with said member, supporting posts for the magnet extending from said frame and hav-' ing shoulders, and a magnetic shield interposed between the field producing means and said magnet, said shield being supported from the frame by being clamped between said frame and the shoulders on said posts.

- 8. In an electricity meter, the combination of a supporting frame, an armature pivoted on said frame, a field coil for said armature, lugs extending from said frame and forming a seat for said field coil, and posts extending from said lugs for locating said field coil in position on said seats.

9. In an electricity meter, the combination of a supporting frame, an armature pivoted to said frame, a field coil for said armature, lugs extendin from said frame and forming seats for said%eld coil, postsextending from said lugs and engaging the field coil to prevent displacement thereof, and a plate se cured to said posts and engaging the field coil to lock said field coil against said seats.

10. In an electricity meter, the combina tion of a supporting frame, an armature pivoted on said frame, a circular field coil spanning the armature, lugs extending from said frame and forming a seat for the field coil, posts extending from said lugs for preventing displacement of the coil, and an annular plate surrounding the armature and clamped to said posts, said plate engagin the field coil to lock said field coil to sai seat.

11. In an electricity meter, the combination of a main frame, an armature, a com.- mutator, integrating mechanism for recording the movements of the armature, supporting arms for said integrating mechanism extending from the main frame, brushes for the commutator, and a brush supporting frame held in position by being clamped betweenthe main frame and said supporting arms.

12. In an electricity meter, the eombina brushes for the commutator, and a brush supporting frame clamped between the main frame and said shoulders.

13. In an electricity meter, the combination of a main frame, an armature, an armature shaft, a bearing for said armature shaft, a supporting arm for said bearing extending from the main frame and secured thereto and having a shoulder, a commutator for the armature, a brush engaging said commutator, and a brush supporting frame for said .brush clamped to the main frame by the shoulder on said arm.

14. In an electricity meter, the combinationof a main frame, an armature, an armature shaft, a bearing for said armature shaft, supporting arms for said bearing extending from the main frame and each having 'a shoulder, a commutator for the armature,

brushes engaging the commutator, and a brush supporting frame clamped to the main frame by the shoulders on said arms.

15. In an electricity meter, the combina- '-tion of a base, an armature shaft, a member 'extendingfrom the base, an element secured lateral removal of sai to' such member to-constitute a bearing for such shaft, and pins extending fromsaid member and engaging in openmgs in said bearing element and adapted for preventing bearing element from such member when the shaft is in the bearing.

16. In an electricity meter, the combination of a base, an armature shaft, a member extending from the base, a plate secured to such member to constitute a bearing for such shaft, and devices extending from said member and engaging said plate and adapted for positioning the bearing and shaft so that the platemust first be removed longitudinally from the shaft before such plate can be removed from such member.

17. In an electricity meter, the combination of a base, an armature shaft, a member extending from the base, an element secured to such member to constitute a bearing for such shaft, and devices for preventing the bearing for such shaft, and devices extend ing from said member and engaging said element and adapted for positioning the bearing and shaft so that the bearing element must first be removed longitudinally from the shaft before such element can be removed. from such member, such element also constituting the support for thefintegrating mechanism of the meter and removable to reset the registering devices.

In witness whereof, I hereunto subscribe my name, this 17 day of November, A. D. 1908.

CHARLES M. CROOK.

- Witnesses: OnAmiEs J. SCHMIDT,

FRANK J. THELEN. 

